||In-house test program report no. 2 : vehicle preconditioning: LA-4 vs. HFET /
Rarick, Thomas. ;
||Environmental Protection Agency, Ann Arbor, Mich. Standards Development and Support Branch.
|| U.S. Environmental Protection Agency, Office of Air and Waste Management, Office of Mobile Source Air Pollution Control, Emission Control Technology Division, Standards Development and Support Branch,
Motor vehicles--Pollution control devices.
Air pollution ;
Test facilities ;
Fuel consumption ;
Exhaust emissions ;
Automobile engines ;
Evaporative emissions ;
Highway fuel economy test ;
Test vehicles ;
Urban dynamometer driving schedule(LA 4)
||NVFEL Library/Ann Arbor, MI
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||[i], 19,  p. : ill., charts ; 28 cm.
The purpose of this study was to determine whether or not the two Highway fuel economy test (HFET) cycles used for measuring fuel economy would be suitable for a preconditioning driving cycle in place of one urban dynamometer driving schedule (LA-4). The main concern with using the HFET was the possibility that the purge characteristics of the evaporative emission control system would allow for purging during preconditioning and not during the exhaust emission cycle which is essentially the same as an LA-4. If this were to occur then sufficient canister capacity would enable a vehicle to pass the evaporative emissions test, and the exhaust test would be easier to pass due to the fact that hydrocarbons from the canister would not be purging into the engine.
"November 1975." Includes bibliographical references (p. 19). Cover title. At head of title: Technical Support for Regulatory Action. "Evap 75-5."